Annual report pursuant to Section 13 and 15(d)

Debt (Senior Notes) (Details)

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Debt (Senior Notes) (Details) - USD ($)
Dec. 31, 2019
Jun. 06, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Face amount of debt $ 3,071,982,000    
Long-term debt 3,266,218,000   $ 2,886,034,000
Senior notes      
Debt Instrument [Line Items]      
Face amount of debt 775,000,000    
Aggregate unamortized premium $ 21,100,000    
Senior notes | 2024 Senior Notes      
Debt Instrument [Line Items]      
Face amount of debt   $ 325,000,000.0  
Interest rate   6.625%  
Senior notes | 2021 Senior Notes      
Debt Instrument [Line Items]      
Face amount of debt   $ 325,000,000.0  
Interest rate   6.75%  
Senior notes | 2025 Senior Notes      
Debt Instrument [Line Items]      
Interest rate   6.875%